Booleans and Shelled solids

 From:  Frenchy Pilou (PILOU)
9939.6 
So seems I was very lucky in my example above! :)

Here a normal result...no need to Planar the section!





I just make some try with always a Curve / Revolve then Shell for make an Ogive...

Curious results : sometime Impossible to make a Boolean Diff
sometime Boolean Diff gives an Open Volume as some posts above
Sometime that works as that must be! :)

EDITED: 10 Sep 2020 by PILOU